Commitments - Additional Information (Detail) (USD $)	12 Months Ended										12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Malaysia	Dec. 31, 2012 Gulf of Mexico	Dec. 31, 2012 Eagle Ford Shale	Dec. 31, 2012 Cameroon	Dec. 31, 2012 Vietnam	Dec. 31, 2012 Brunei Offshore	Dec. 31, 2012 Drilling Rigs And Associated Equipment	Dec. 31, 2012 Processing Production Handling and Transportation Services	Dec. 31, 2011 Processing Production Handling and Transportation Services	Dec. 31, 2010 Processing Production Handling and Transportation Services	Dec. 31, 2012 El Dorado Promise Annual Commitment from 2007 to 2016	Jan. 31, 2011 El Dorado Promise Annual Commitment from 2007 to 2016	Dec. 31, 2010 El Dorado Promise Annual Commitment from 2007 to 2016	Dec. 31, 2006 El Dorado Promise Annual Commitment from 2007 to 2016
Commitments and Contingencies Disclosure [Line Items]
Operating lease rental payments due in 2013	$ 225,758,000										$ 36,394,000
Operating lease rental payments due in 2014	233,786,000										35,224,000
Operating lease rental payments due in 2015	191,312,000										30,226,000
Operating lease rental payments due in 2016	140,655,000										19,427,000
Operating lease rental payments due in 2017	123,401,000										13,864,000
Rental expenses for noncancellable lease, including contingent payments	178,292,000	185,016,000	178,410,000
Future commitments										1,251,777,000				5,000,000
Processing and transportation charges											19,733,000	24,791,000	10,337,000
Commitments for capital expenditures	2,424,400,000			977,800,000	242,000,000	474,100,000	124,100,000	91,500,000	146,800,000								38,700,000
Accretion costs														$ 1,063,000	$ 1,317,000	$ 1,534,000